The treatment of diarrhea must be targeted according to the specific causes of the patient. Therefore, if the diarrhea is caused by a bacterial intestinal infection, especially an infection caused by Gram-negative bacilli, taking norfloxacin is effective. Because norfloxacin is an antibiotic that mainly has the ability to fight infections. It has certain effects against some pathogenic bacteria in the intestines, as well as those in the respiratory system and urinary system. Of course, it should also be used under the guidance of a professional doctor. Never abuse medications, as pregnant women and teenagers cannot use this type of drugs. Additionally, diarrhea may also be caused by inflammatory bowel disease, intestinal flora imbalance, or even tumors. So, the primary disease should be treated.